Finding the Fourth Proportional to 19,620.63, 29,443.48 and 7,139.45

Step by Step Solution

1. Step 1: Write the proportion equation
   19,620.63 : 29,443.48 = 7,139.45 : x
2. Step 2: Convert to fraction form
   19,620.63/29,443.48 = 7,139.45/x
3. Step 3: Cross multiply
   19,620.63x = 29,443.48 × 7,139.45
4. Step 4: Simplify right side
   19,620.63x = 210,210,309.05
5. Step 5: Solve for x
   x = 210,210,309.05/19,620.63
6. Step 6: Final answer
   x = 10,713.74